A High Performance of ENi–P Coatings on Mechanical and Tribological Properties with Influence of Bath pH on AZ91 Magnesium Alloy
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- 作者：Mohd. Imran Ansari ; Dineshsingh G. Thakur
- 关键词：Electroless Ni–P alloy coatings ; Microhardness ; pH (NaOH) solution ; Wear resistance
- 刊名：Journal of Failure Analysis and Prevention
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：17
- 期：1
- 页码：100-106
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Tribology, Corrosion and Coatings; Characterization and Evaluation of Materials; Classical Mechanics; Structural Mechanics; Quality Control, Reliability, Safety and Risk;
- 出版者：Springer US
- ISSN：1864-1245
- 卷排序：17
文摘
Electroless nickel–phosphorus (ENi–P) coating was carried out on AZ91 magnesium alloy substrates by varying the bath solutions pH. The ENi–P coating process was carried out with sodium hydroxide as the pH adjuster. The effect of bath pH values on surface characteristics and wear resistance properties were investigated after deposition on AZ91 magnesium alloy substrates. Three suitable bath compositions with different pH were prepared for coating the substrates. Encouraging results for ENi–P deposit were obtained when the bath pH value was maintained at 6.5. A smooth and uniform microstructure was observed in the deposit obtained from bath B (6.5 pH). It also enhanced the microhardness and wettability, while the surface roughness of the ENi–P deposit reduced considerably, thereby resulting in better wear resistance and also preventing regular or early failures, and improving service life.